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Low‐Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition
- Source :
- Journal of Geophysical Research: Atmospheres. 126
- Publication Year :
- 2021
- Publisher :
- American Geophysical Union (AGU), 2021.
-
Abstract
- During summer, the Southern Ocean is largely unaffected by anthropogenic emissions, which makes this region an ideal place to investigate marine natural aerosol sources and processes. A better understanding of natural aerosol is key to constrain the preindustrial aerosol state and reduce the aerosol radiative forcing uncertainty in global climate models. We report the concentrations of gaseous sulfuric acid, iodic acid, and methanesulfonic acid (MSA) together with a characterization of new particle formation (NPF) events over a large stretch of the Southern Ocean. Measurements were conducted on board the Russian icebreaker Akademik Tryoshnikov from January to March 2017. Iodic acid is characterized by a particular diurnal cycle with reduced concentration around noon, suggesting a lower formation yield when solar irradiance is higher. Gaseous MSA does not have a diurnal cycle and measured concentrations in gas and condensed phase are compatible with this species being primarily produced via heterogeneous oxidation of dimethyl sulfide and subsequent partitioning into the gas phase. We also found that NPF in the boundary layer is mainly driven by sulfuric acid but it occurred very rarely over the vast geographical area probed and did not contribute to the cloud condensation nuclei budget in a directly observable manner. Despite the near absence of NPF events in the boundary layer, Aitken mode particles were frequently measured, supporting the hypothesis of a free tropospheric source. Iodic acid and MSA were not found to participate in nucleation, however, MSA may contribute to aerosol growth via heterogeneous formation in the aqueous phase.
- Subjects :
- Atmospheric Science
Ideal (set theory)
010504 meteorology & atmospheric sciences
Sulfuric acid
010501 environmental sciences
Iodic acid
Atmospheric sciences
114 Physical sciences
01 natural sciences
Methanesulfonic acid
Circumnavigation
Aerosol
chemistry.chemical_compound
Geophysics
chemistry
13. Climate action
Space and Planetary Science
Earth and Planetary Sciences (miscellaneous)
Environmental science
Particle
14. Life underwater
Volatility (finance)
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 21698996 and 2169897X
- Volume :
- 126
- Database :
- OpenAIRE
- Journal :
- Journal of Geophysical Research: Atmospheres
- Accession number :
- edsair.doi.dedup.....883a480ca2253a6031c080f1f8a9b3a2